Pressure-induced heavy-fermion superconductivity in antiferromagnet CeIrSi3 without inversion symmetry

We report the discovery of pressure-induced superconductivity in an antiferromagnet CeIrSi3, which lacks inversion symmetry in the tetragonal crystal structure. The Neel temperature T-N = 5.0 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 2.5 GPa. Superconductivity appears in a wide pressure region from 1.8 GPa to about 3.5 GPa. with a relatively large superconduting transition temperature T-Sc = 1.6 K and a large tipper critical field H-c2(0) = 11.1 T at 2.5GPa, indicating heavy-fermion superconductivity.